Table 3 Analysis of soil bacterial community alpha diversity at the 0–20 cm and 20–40 cm soil depths.

Soil depth (cm)	Alpha diversity indices	Macroaggregate				Microaggregate				Silt + clay
Soil depth (cm)	Alpha diversity indices	CK	CF	CS	CB	CK	CF	CS	CB	CK	CF	CS	CB
0–20	Chao1	4383a	4337a	4242a	4510a	4110b	4280ab	4275ab	4415a	4102b	4173ab	4143b	4476a
	Shannon	6.493b	6.636ab	6.422b	7.013a	6.630a	6.682a	6.618a	6.828a	6.561ab	6.359b	6.443b	6.948a
	Simpson	0.990ab	0.992ab	0.990b	0.996a	0.992b	0.994ab	0.993ab	0.996a	0.991a	0.983a	0.991a	0.995a
	Simpsoneven	0.039b	0.041b	0.035b	0.083a	0.042b	0.055ab	0.045b	0.078a	0.043b	0.030b	0.037b	0.092a
20–40	Chao1	3460a	4333a	3883a	4393a	3914a	4210a	3767a	4226a	3730a	3970a	3535a	4215a
	Shannon	6.106a	6.446a	6.066a	6.646a	6.360a	6.647a	5.884a	6.709a	6.186a	6.465a	5.964a	6.552a
	Simpson	0.984ab	0.989ab	0.982b	0.995a	0.986a	0.994a	0.936a	0.996a	0.983a	0.992a	0.973a	0.994a
	Simpsoneven	0.025b	0.034b	0.026b	0.069a	0.029b	0.053ab	0.064a	0.069a	0.035ab	0.060ab	0.022b	0.069a

The values indicate the average data for each index (n = 3). Different letters shown after the values indicate significant differences (ANOVA, p < 0.05).

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